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30 
Fishfinder 250/250C Owner’s Manual
To calibrate the water speed:
1.   Use the 
ARROW keys to highlight Calibrate Water Speed 
and press 
ENTER.
2.  Bring the boat to a cruising speed. Both the top GPS ground 
speed and uncalibrated water speed will be shown at the 
bottom of the calibration window. Note your top speed, then 
stop the boat and press 
ENTER.
3.  By default, the top speed will automatically show in the 
What 
was your top water speed? field. If a ground speed is not 
available, the top uncalibrated water speed is used instead. 
If the new speed is correct, highlight 
OK and press ENTER
To manually enter a calibration, press 
ENTER on the speed 
field, enter a new speed and press 
ENTER.
 
NOTE: If the boat is not moving fast enough or the speed sensor 
is not registering a speed, a “Boat Is Not Moving Fast Enough 
To Calibrate” message is displayed at the bottom of the screen. 
Check that the speed sensor wheel is moving or safely increase 
boat speed. If there is a problem with the speed sensor/unit or 
if a speed senor is not installed, a “Water Speed Sensor Is Not 
Working” message is displayed at the bottom of the screen. 
Check the connections of speed sensor cables.
Time Tab
The Time tab displays the current time and date, allows you to 
adjust the 12- or 24-hour time format, select a time zone, and 
adjust for daylight saving to show correct local time. The time will 
only display if you are receiving valid NMEA input from a GPS 
unit (pages 8-9) or in Simulator mode. The following settings are 
available:
• 
Time Format—choose from 12- or 24-hour (military) format.
• 
Time Zone—choose the correct local time zone or enter your 
UTC Offset. The UTC (also called Greenwich mean time) 
offset is how many hours you are ahead or behind the time 
line.
• 
Daylight Saving Time—choose from AutoOn, or Off to 
adjust for daylight saving.
• 
Current Time and Current Date—display current time 
and date. Fields will be blank if not receiving a time from an 
attached GPS. It is not possible to edit these fields.
Main Menu—Time tab